The Second Regular Session of the 7th Philippine Legislature was formally opened at the building on July 11, 1926.

This was to contain a large capitol building to house the Philippine Legislature and ancillary structures for the offices of representatives.

On March 26, 1920, the Philippine Legislature passed Act.

The Philippine Legislature was the legislative body of the Philippines during the earlier part U.S. colonial administration.

The Philippine Legislature continued to serve as the country's legislative body until 1935, when the Commonwealth of the Philippines was established.

The passage of Act 2683 by the Philippine Legislature in March 1917 defined the present geographical boundary of the province.

The opening of the first Philippine Legislature of the post-Marcos era.

It separated the Philippine Legislature in two "camps", the Antis and the Pros.

In 1910, the meeting of the Second Philippine Legislature was held at The Mansion for three weeks.

In 1908, the Philippine Legislature approved Act No. 1870, which created the University of the Philippines.